ParameterAttributes 枚举


定义可以与参数相关联的属性。Defines the attributes that can be associated with a parameter. 这些属性在 CorHdr.h 中进行定义。These are defined in CorHdr.h.

此枚举有一个 FlagsAttribute 属性,允许按位组合成员值。

public enum class ParameterAttributes
public enum ParameterAttributes
type ParameterAttributes = 
Public Enum ParameterAttributes


HasDefault 4096

指定参数具有默认值。Specifies that the parameter has a default value.

HasFieldMarshal 8192

指定该参数具有字段封送处理信息。Specifies that the parameter has field marshaling information.

In 1

指定该参数是一个输入参数。Specifies that the parameter is an input parameter.

Lcid 4

指定该参数是一个区域设置标识符 (lcid)。Specifies that the parameter is a locale identifier (lcid).

None 0

指定不存在参数属性。Specifies that there is no parameter attribute.

Optional 16

指定参数为可选。Specifies that the parameter is optional.

Out 2

指定该参数是一个输出参数。Specifies that the parameter is an output parameter.

Reserved3 16384


Reserved4 32768


ReservedMask 61440

指定该参数是保留的。Specifies that the parameter is reserved.

Retval 8

指定该参数是一个返回值。Specifies that the parameter is a return value.


下面的示例显示指定参数的属性。The following example displays the attributes of the specified parameter.

using namespace System;
using namespace System::Reflection;
using namespace System::Runtime::InteropServices;
public ref class paramatt
   static void mymethod( String^ str1, [Out]interior_ptr<String^> str2, interior_ptr<String^> str3 )
       *str2 = "string";


int main()
   Console::WriteLine( "\nReflection.ParameterAttributes" );
   // Get the Type and the method.
   Type^ Mytype = Type::GetType( "paramatt" );
   MethodBase^ Mymethodbase = Mytype->GetMethod( "mymethod" );
   // Display the method.
   Console::Write( "\nMymethodbase = {0}", Mymethodbase );
   // Get the ParameterInfo array.
   array<ParameterInfo^>^Myarray = Mymethodbase->GetParameters();
   // Get and display the attributes for the second parameter.
   ParameterAttributes Myparamattributes = Myarray[ 1 ]->Attributes;
   Console::Write( "\nFor the second parameter:\nMyparamattributes = {0}, which is an {1}", (int)Myparamattributes, Myparamattributes );
   return 0;

using System;
using System.Reflection;
class paramatt
    public static void mymethod (string str1, out string str2, ref string str3)
        str2 = "string";
    public static int Main(string[] args)
        // Get the Type and the method.
        Type Mytype = Type.GetType("paramatt");
        MethodBase Mymethodbase = Mytype.GetMethod("mymethod");
        // Display the method.
        Console.Write("\nMymethodbase = " + Mymethodbase);
        // Get the ParameterInfo array.
        ParameterInfo[] Myarray = Mymethodbase.GetParameters();
        // Get and display the attributes for the second parameter.
        ParameterAttributes Myparamattributes = Myarray[1].Attributes;
        Console.Write("\nFor the second parameter:\nMyparamattributes = " 
            + (int) Myparamattributes
            + ", which is an "
            + Myparamattributes.ToString());
        return 0;
Imports System.Reflection

Class paramatt

    Public Shared Sub mymethod(ByVal str1 As String, ByRef str2 As String, _
    ByRef str3 As String)
        str2 = "string"
    End Sub

    Public Shared Function Main() As Integer
        Console.WriteLine(ControlChars.CrLf + "Reflection.ParameterAttributes")

        ' Get the Type and the method.
        Dim Mytype As Type = Type.GetType("paramatt")
        Dim Mymethodbase As MethodBase = Mytype.GetMethod("mymethod")

        ' Display the method.
        Console.WriteLine("Mymethodbase = " + Mymethodbase.ToString())

        ' Get the ParameterInfo array.
        Dim Myarray As ParameterInfo() = Mymethodbase.GetParameters()

        ' Get and display the attributes for the second parameter.
        Dim Myparamattributes As ParameterAttributes = Myarray(1).Attributes

        Console.WriteLine("For the second parameter:" + ControlChars.CrLf _
           + "Myparamattributes = " + CInt(Myparamattributes).ToString() _
           + ", which is a " + Myparamattributes.ToString())

        Return 0
    End Function
End Class


若要获取ParameterAttributes该值, 请先Type获取。To get the ParameterAttributes value, first get the Type. TypeParameterInfo获取数组。From the Type, get the ParameterInfo array. ParameterAttributes值在数组中。The ParameterAttributes value is within the array.

这些枚举器值依赖于可选元数据。These enumerator values are dependent on optional metadata. 并非所有属性都可从所有编译器获得。Not all attributes are available from all compilers. 请参阅相应的编译器说明, 确定可用的枚举值。See the appropriate compiler instructions to determine which enumerated values are available.